The present invention relates to a method and a compacting plant for recycling a byproduct containing a large amount of an oil component in the form of dust or sludge in a process for manufacturing iron-based molten iron in a compacting process of reduced iron,; A reducing iron storage tank connected to the fluidized-bed reduction reactor through a reduced iron discharge pipe, for storing the reduced iron and supplying the reduced iron to the compacting facility; A compacting unit for compacting the reduced iron conveyed from the reduced iron storage tank; And a transfer means for transferring the byproduct compacted material generated in the molten iron manufacturing process through the byproduct supply pipe, wherein the byproduct supply pipe is connected to at least one selected from the fluidized-bed reactors, the reduced-And a compacting method according to the present invention.;
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